Ok so I am trying to wrap up the 580 project and get it out for a test spin! I had this same issue last year, but I thought the head gasket would fix the issue. (blew a head gasket near end of season) Here is what it does, it starts 1 pull no problem when its cold and sitting for a day or two. warm it up and it will run great, drives fine too. If I blast it full throttle for a few seconds and let off it will drop the idle to around 1k rpms and bog unless I pump the throttle. The sled has plenty of power, runs real good other than this. Now after riding for a bit if I shut it off, I can't start it for at least 10 mins. I can sooner but there is a trick I figured out to it. To start it back up I have to unplug the injectors give it a rip, than while it idles I have to plug the injectors back in. I am pretty sure its flooding. Now when I kill it I use the kill switch on the handlebars, the ign is unplugged. when I try to start it and it doesn't the efi blinks 1 flash. That is correct from what I a was told. I did notice that after the sled is started the efi blinks slow and steady. I am about to go take a video of the sled now, so I will post that up to help discribe the issue.